As soon as the engine wouldn't start, I would check for
spark and proper fuel pressure. The most common failure
that fits your description is a fuel pump. When the car and
the pump are cold, the pump works ok but after it runs for
a while, the bushings and pump housing warm up, things
get sloppy inside the pump and once you shut it off, it
won't engage again until it cools down. Check the pressure
with a gauge - just pressing the fuel pressure relief
(schrader) valve does not indicate adequate pressure. I see
it frequently (in Crown Victoria PI's) when a Deputy shuts
the car off after several hours and it won't restart. It gets
towed in and I hit the key and drive it right into the shop.
The fuel pump is either noisy or makes no noise at all and
does not provide adequate pressure for very long.
Sometimes, you can hit the fuel tank with a mallet and jar
the pump enough to let it run - but only sometimes.

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